The blocky coal gangue was broken by a jaw crusher into small particles with a size range of 1 mm–10 mm. The particles were dried at 100 °C for 24 h and then calcined at different temperatures (400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C, 1000 °C and 1200 °C) with different holding times (0.5 h, 1 h, 1.5 h, 2 h and 3 h) and cooling …
Waste discharge and surface damage are the unavoidable consequences of coal mining. However, filling waste into goaf can help reuse waste materials and protect …
Table 1 Chemical compositions of coal gangue and cement clinker/wt% Raw materials SiO 2 Al 2O 3 Fe 2O 3 CaO MgO K 2O Na 2O SO 3 LOI Coal gangue 58.00 17.66 5.23 1.44 1.60 1.43 0.19 2.70 11.52 Clinker 22.78 4.54 2.90 66.06 1.72 0.63 0.18 0.28 0.53 Table 2 Mechanical strength of the clinker Flexural strength/MPa Compressive strength …
The present invention discloses a coal gangue active composite material used in cement concrete with high performance and a preparation process of the coal gangue active composite material. The preparation process of the coal gangue active composite material comprises the steps of calcining 80 to 97 wt% of raw material coal gangue and 3 to 20 …
High-ductility cement-based composite materials have been well employed in the repair of concrete pavement layers on roads and bridges [6–9]. Fang et al. [10] synthesized high-ductility cement-based composite materials using Nissan Colly polyvinyl alcohol (PVA) fibers and FA, such that a 28 d ultimate elongation of 1.8% to 2.35% was achieved.
2. Utilization of Coal Gangue. For years, researchers have been working on the effective utilization of the enormous stocked coal gangue. In China, more than a half …
Raw materials. The CGBM is composed of cement, fly ash, coal gangue, and water according to the mass ratio of 1:2:5:2 evenly mixed (Guo et al. 2022; Zhao et al. 2022a, b; Du et al. 2019).The cement is ordinary Portland cement 42.5 produced by Taiyuan Shishou Cement Co., with a specific surface area of 4500cm 2 /g, and initial …
Coal gangue is a mixture of a variety of rock and mineral composition with low carbon content. Normally, its calorific value increases with the increase of carbon mass fraction and volatiles, in contrast, decreases with the increase of ash. Because of the high content of SiO 2 and Al 2 O 3, the ash melting point of coal gangue is quite high ...
Coal gangue-based cemented backfill material (CGCBM) is developed for backfilling the goaf in coal mines. As fresh CGCBM. slurry is generally transported into underground openings through a ...
The stress-strain curve of mixed size gangue in the loading process are displayed in Fig. 4.Gangue is in a natural heap state before loading. As the broken blocks inside the sample are irregular polygonal blocks, and their edges and corners touch each other, the gap in the backfill bodies gradually increases with increasing Talbot's index n, …
Light Aggregate Concrete," the water–cement ratio of coal gangue mixed aggregate concrete is a xed value of 0.43, and coarse aggregate of coal gangue replaces coarse aggregate of pumice with equal volume, with substitu-tion rates of 0%, 20%, 40%, 60%, 80%, and . e group with substitution rate of 0% is marked as MFC-0.
Gangue. In mining, gangue ( / ɡæŋ /) [1] is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit. It is thus distinct from overburden, which is the waste rock …
The third type of admixture involves other materials. Adding large quantities of coal gangue to cement-stabilised soil [7] can increase the compressive strength by 80%, but this technology is ...
Eco-gelled coal gangue materials (EGCGMs) are usually produced using coal gangue, slag, and fly ash in a highly alkaline environment. Herein, to improve the mechanical properties of such materials, polypropylene fibers were uniformly mixed with them. An unconfined compressive strength test and a three-point bending test of the …
High-ductility cement-based composite materials have been well employed in the repair of concrete pavement layers on roads and bridges [6–9]. Fang et al. [10] synthesized high-ductility cement-based composite materials using Nissan Colly polyvinyl alcohol (PVA) fibers and FA, such that a 28 d ultimate elongation of 1.8% to 2.35% was …
The raw materials utilized in this test for the CGBD are coal gangue, fly ash, cement, and water. The coal gangue is obtained from a coal mine located in the Binhuang mining area and crushed into fine (0–5 mm), medium (5–10 mm), and coarse (10–20 mm and 20–30 mm) particle sizes by sieving.
Adding modified materials to coal gangue concrete is a viable future development direction. ... Adding modified materials to coal gangue concrete is a viable future development direction. ... W.L. …
Building materials consume a large number of ore resources, and coal gangue as building material has appeared in recent years in the preparation of sintered bricks, concrete aggregate, and cement production. Dong et al. [9] mixed coal gangue as fine aggregate into concrete, and the coal gangue calcined at 700°C had the highest …
DOI: 10.1007/s12205-024-1956-9 Corpus ID: 267904660; Study on Hydration and Hardening Performance of Coal Gangue-Steel Slag-Cement Composite Cementitious Material @article{Zhao2024StudyOH, title={Study on Hydration and Hardening Performance of Coal Gangue-Steel Slag-Cement Composite Cementitious Material}, …
CG with high content of iron phase can be used to extract iron ore [24,25]. More importantly, if CG with high content of iron phase can be sorted out, the color of calcined coal gangue (CCG) active powder material can be adjusted so that it can be mixed into cement-based materials with high content, and the amount of clinker can be …
2. Utilization of Coal Gangue. For years, researchers have been working on the effective utilization of the enormous stocked coal gangue. In China, more than a half of discharged coal gangue is used for land reclamation—one third of that is used for power generation and the rest is used for producing building materials [2,4].However, the main …
In this paper, coal gangue powder (CGP) was used to replace 30% of the cement weight. The dosage of steel slag powder (SSP) was 5%, 10%, 15%, 20%, and 25% of the coal …
Compared with normal concrete, ... the proportions of NS and UFS are 0.4% and 5% of binding material amount, respectively. For the optimal mix proportion, the thermal conductivity coefficient and compressive strength of the concrete are 0.41 W m −1 k −1 and 37.7 MPa, ...
The aqueous solutions were mixed with gangue and used to improve gangue for road. Penetration performance. The permeability of a powdered material is related to the thickness of the bound water film and the pore structure [41], which indirectly affects the frost resistance of the material.
Cemented backfill mining is a green mining method that enhances the coal mining rate and the safety of mined-out regions. To transport the cemented gangue …
coal gangue brick manufacturing process sudan We developed various tunneling and mining equipment based on our great experience in coal mining Nowadays our equipment is widely Coal gangue processing andadd a the gangue production line for cement admixture material beneficio gangue mill for cement mixed material to add material …
The density of hardened concrete increased from 2171 kg m −3 for concrete of mix V (using coal gangue to replace 30% of the gravel and using fly ash to replace 15% of the cement) to 2488 kg m −3 for concrete of mix I (no use of fly ash and coal gangue), as shown in Fig. 5. Because of the low density of the coal gangue, the …
The addition of slag can significantly improve the compressive strength of coal gangue geopolymers and produce flocculent C–(A)–S–H gels with high Ca/Si, Ca/Al, and Si/Al ratios, thus increasing the compactness of alkali-activated coal gangue-slag cementitious material. By adding a certain amount of slag as a calcium source, coal …
Coal gangue-based cemented backfill material (CGCBM) is developed for backfilling the goaf in coal mines. As fresh CGCBM slurry is generally transported into underground openings through a pipeline, and after hardening, it plays the role of supporting the overlying strata. The fluidity, stability, and mechanical (compressive …
Abstract. This paper developed a kind of concrete with coal gangue as coarse aggregate in order to solve the environmental pollution problem and meet the requirement of filling material in gob ...
Disclosed are coal slack active mixed material used in cement concrete with high performance and its preparing method burn 80~97wt% coal slack, 3~20wt% …
Coal gangue-based geopolymer (CGGP) is one of the hot spots existing in the recycling of coal gangue resources due to its good comprehensive mechanical properties. However, the coal gangue structure is stable and reactivity is poor, so the coal gangue needs to be activated before utilization. In this paper, the microstructure …
The red mud and coal gangue (at a ratio of 3:2) were mixed together and shaped in small spheres with a water to solid ratio of 0.30 and then calcined at 600 degrees C for 2h. Subsequently, the RGC ...
The cementitious materials of this study were Ordinary Portland cement (P.O.42.5) from Tianjin Cement Plant, fly ash (FA) from Hebei Yaoxin Plant, and coal gangue (CG) from Hebei Longxin Plant. Note that five different fineness of coal gangue were selected, which were 200, 325, 500, 1250 and 2000 mesh respectively.
The capture of carbon dioxide (CO 2) has attracted significant attention to reduce the emissions of greenhouse gases.However, the development of adsorptive materials remains to be a grand challenge. In this work, we successfully synthesized low silica X (LSX) zeolites from low-grade coal gangue (mass ratio of Al 2 O 3 /SiO 2 < …
